diff --git a/CMakeLists.txt b/CMakeLists.txt
index a62f3c2f..d3948416 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -102,8 +102,10 @@ macro(sak_import_module src_dir_name)
   endif()
 endmacro()
 
-sak_import_module("canbusstudio")
-sak_import_module("modbusstudio")
+if(NOT Qt6_VERSION VERSION_LESS "6.5.0")
+  sak_import_module("canbusstudio")
+  sak_import_module("modbusstudio")
+endif()
 
 # QtSwissArmyKnife)
 include_directories(src)
@@ -137,15 +139,16 @@ if(APP_EABLE_ASSISTANTS)
   add_subdirectory(${CMAKE_SOURCE_DIR}/src/assistants)
 endif()
 
+if(NOT Qt6_VERSION VERSION_LESS "6.5.0")
 option(APP_EABLE_CANBUSSTUDIO "Enable to build CANBusStudio." ON)
 if(APP_EABLE_CANBUSSTUDIO)
   add_subdirectory(${CMAKE_SOURCE_DIR}/src/canbusstudio)
 endif()
-
 option(APP_EABLE_MODBUSSTUDIO "Enable to build ModbusStudio." ON)
 if(APP_EABLE_MODBUSSTUDIO)
   add_subdirectory(${CMAKE_SOURCE_DIR}/src/modbusstudio)
 endif()
+endif()
 
 # For Qt6.4 and later.
 if(QT_VERSION_MAJOR EQUAL 6 AND QT_VERSION_MINOR GREATER_EQUAL 4)
diff --git a/src/sakmainwindow.cc b/src/sakmainwindow.cc
index e56e82ff..d5a23c94 100644
--- a/src/sakmainwindow.cc
+++ b/src/sakmainwindow.cc
@@ -112,7 +112,7 @@ SAKMainWindow::SAKMainWindow(QWidget* parent)
 
     QString title = QString("Qt Swiss Army Knife");
 #ifndef SAK_IMPORT_MODULE_PRIVATE
-    QString title = tr("(Community)");
+    title.append(tr("(Community)"));
 #endif
     title.append(QString(" "));
     title.append(QString("v"));